here, this is how it's set up. doug recommended doing this as it'll probably put less strain on my center diff.

FL: 205/40/17 0--------0 FR: 215/40/17
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RL: 225/45/17 0--------0 RR: 205/40/17

so, essentially the two diffs are contradicting each other. Between the 205 and 225; there's about 25mm difference in tyre diameter.